Patent US170573A successfully refreshed from Google Patents.
US3847784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous cadmium anode and a method of forming it, and a primary cell using the anode
Assignee: Duracell Inc Canada
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Filing: 1972-07-28
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Granted: 1974-11-12
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Expires: 1992-07-28
Abstract
Abstract A porous anode for an electric cell, formed of cadmium powder in dendritic and acicular form and pressed to shape at ambient temperature, without including a filler that is to be later extracted; AND THE METHOD OF FORMING THE POWDER IN DENDRITIC AND ACICULAR FORM IN GENERALLY UNIFORM SIZE AND SHAPE, BY ELECTRODEPOSITION FROM A SUITABLE ELECTROLYTE IN A VERTICAL ELECTRIC FIELD ONTO A HORIZONTAL COLLECTING CATHODE AND FROM THENCE TO BE COLLECTED AND WASHED AND COMPRESSED INTO SHAPE AS AN ANODE; AND AN ELECTRIC CELL UTILIZING SUCH AN ANODE.
Inventors
- 👤 F Przybyla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:13
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/38; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A METHOD OF FORMING AN ANODE CONSISTING ESSENTIALLY OF CADMIUM POWDER OF IMPROVED ELECTROCHEMICAL ACTIVITY, WHEREIN THE CADMIUM POWDER IS IN THE FORM OF NEEDLES AND DENDRITES AND IS OF SUBSTANTIALLY UNIFORM PARTICLE SIZE, SAID METHOD COMPRISING THE STEPS OF: ELECTRODEPOSITING A CADMIUM POWDER FROM A SOLUTION CONTAINING CADMIUM IONS IN A CONCENTRATION RANGING FROM 0.05 TO 0.18 GRAM IONS PER LITER OF CD++ DISSOLVED IN A SUPPORTING ELECTROLYTE, SAID SOLUTION DISPOSED ABOVE A HORIZONTAL ANODE AND A HORIZONTAL COLLECTING CATHODE, SAID AMODE PARALLEL TO SAID CATHODE; INCREASING THE CATHODIC DEPOSITION CURRENT DENSITY AT SAID HORIZONTAL COLLECTING CATHODE FROM A MINIMUM VALUE OF NOT LESS THAN EIGHTY MILLIAMPERES PER SQUARE CENTIMETER TO A MAXIMUM VALUE OF NOT MORE THAN 400 MILLIMAPERES PER SQUARE CENTIMETER DURING A PREDETERMINED INTERVAL OF DEPOSITION; COLLECTING AND WASHING SAID CADMIUM POWDER; AND APPLYING SUFFICIENT PRESSURE TO SAID CADMIUM POWDER AT AMBIENT TEMPERATURE TO FORM A POROUS SELF-SUPPORTING CADMIUM ANODE, OF FROM 55 PERCENT TO 80 PERCENT POROSITY.
Claim 2
Independent Claim
162 words
A METHOD OF FORMING AN ANODE CONSISTING ESSENTIALLY OF CADMIUM POWDER OF IMPROVED ELECTROCHEMICAL ACTIVITY, WHEREIN THE CADMIUM POWDER IS IN THE FORM OF NEEDLES AND DENDRITES AND IS OF SUBSTANTIALLY UNIFORM PARTICLE SIZE, SAID METHOD COMPRISING THE STEPS OF: ELECTRODEPOSITING A CADMIUM POWDER FROM A SOLUTION CONTAINING CADMIUM IONS IN A CONCENTRATION RANGING FROM 0.05 TO 0.18 GRAM IONS PER LITER OF CD++ DISSOLVED IN A SUPPORTING ELECTROLYTE, SAID SOLUTION DISPOSED ABOVE A HORIZONTAL ANODE AND A HORIZONTAL COLLECTING CATHODE, SAID AMODE PARALLEL TO SAID CATHODE; INCREASING THE CATHODIC DEPOSITION CURRENT DENSITY AT SAID HORIZONTAL COLLECTING CATHODE FROM A MINIMUM VALUE OF NOT LESS THAN EIGHTY MILLIAMPERES PER SQUARE CENTIMETER TO A MAXIMUM VALUE OF NOT MORE THAN 400 MILLIMAPERES PER SQUARE CENTIMETER DURING A PREDETERMINED INTERVAL OF DEPOSITION; COLLECTING AND WASHING SAID CADMIUM POWDER; AND APPLYING SUFFICIENT PRESSURE TO SAID CADMIUM POWDER AT AMBIENT TEMPERATURE TO FORM A POROUS SELF-SUPPORTING CADMIUM ANODE, OF FROM 55 PERCENT TO 80 PERCENT POROSITY.
Claim 3
Dependent Claim
19 words
A method as in claim 1 in which a time interval of deposition is not longer than 30 minutes.
Claim 4
Dependent Claim
29 words
A method as in claim 1 in which the supporting electrolyte is 1 to 1 1/2 moles acetic acid and 1 to 1 1/2 moles potassium acetate per liter.
Claim 5
Dependent Claim
23 words
A method as in claim 1 in which the supporting electrolyte is 1.0 to 2.0 moles of sulphuric acid per liter of solution.
Claim 6
Dependent Claim
23 words
A method as in claim 1 in which the supporting electrolyte is 1 to 2 moles of alkali hydroxide per liter of solution.
Claim 7
Dependent Claim
48 words
The method, as in claim 1, in which the area of the anode electrode and the area of the lower cathode electrode are such as to establish an electric field between them, when energized, that will be substantially parallel to the field of gravity between the two electrodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |